CN102244538A - System and method for detecting sub-optical fibers, ODN (optical distribution network) and optical splitter - Google Patents

System and method for detecting sub-optical fibers, ODN (optical distribution network) and optical splitter Download PDF

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CN102244538A
CN102244538A CN2010101671541A CN201010167154A CN102244538A CN 102244538 A CN102244538 A CN 102244538A CN 2010101671541 A CN2010101671541 A CN 2010101671541A CN 201010167154 A CN201010167154 A CN 201010167154A CN 102244538 A CN102244538 A CN 102244538A
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CN102244538B (en
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温运生
赵峻
王波
单小磊
王世军
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0773—Network aspects, e.g. central monitoring of transmission parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0083—Testing; Monitoring

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Abstract

本发明实施例提供一种分支光纤检测系统，包括主干光纤、分光模块和多个分支光纤，所述分光模块包括至少一个分光器，其各个端口按照预设规则设置有用于对传送至所述分光器端口的光信号进行带通滤波的光学膜，且所述光学膜使得所述分光模块中与各个分支光纤相对应的测试链路的通带不同；所述测试设备用于根据待测分支光纤所对应的分光器端口，在测试光谱中选择与所述分光器端口的光学膜相匹配的测试波长子带，向光纤网络发送与所选测试波长子带相对应的测试信号，并且接收所述测试信号在对应分支光纤反射而形成的反射信号，并根据反射信号获取所述待测分支光纤的信道特性。本发明实施例还提供一种分支光纤检测方法、光分配网络和分光器。

Figure 201010167154

An embodiment of the present invention provides a branch optical fiber detection system, including a trunk fiber, a splitting module, and a plurality of branch fibers. An optical film for band-pass filtering the optical signal at the port of the optical device, and the optical film makes the passbands of the test links corresponding to each branch optical fiber in the optical splitting module different; The corresponding optical splitter port selects a test wavelength subband matching the optical film of the optical splitter port in the test spectrum, sends a test signal corresponding to the selected test wavelength subband to the optical fiber network, and receives the The reflection signal formed by the reflection of the test signal on the corresponding branch fiber, and the channel characteristics of the branch fiber to be tested are acquired according to the reflection signal. The embodiment of the invention also provides a branch optical fiber detection method, an optical distribution network and an optical splitter.

Figure 201010167154

Description

Branch optical fiber detection system and method, Optical Distribution Network and optical splitter
Technical field
The present invention relates to technical field of optical network communication, relate in particular to a kind of branch optical fiber detection system and method, and a kind of Optical Distribution Network and optical splitter that can be used for above-mentioned branch optical fiber detection system.
Background technology
EPON (Passive Optical Network, PON) system is the optical access network system of a kind of point to multiple spot, it generally includes optical line terminal (the Optical Line Terminal that is positioned at local side, OLT) and be positioned at user side a plurality of optical network units (Optical Network Unit, ONU).(Optical Distribution Network ODN) connects, and this ODN generally includes optical splitter wherein to adopt Optical Distribution Network between OLT and the ONU.This optical splitter can be used for realizing and will distribute to respective user by branch optical fiber from the downlink optical signal of local side, and will converge to trunk optical fiber from each user's uplink optical signal and send to local side apparatus.
For realizing that optical fiber detects; in the optical splitter of existing ODN; the user-side port that connects different branch optical fibers can be provided with different band pass filters usually; and the trunk optical fiber that is connected with local side apparatus can be connected with optical time domain reflectometer (Optical Time Domain Reflectometer, OTDR).When carrying out the optical fiber detection, this OTDR can send the test spectral with a plurality of different centre wavelengths, and wherein each centre wavelength of this test spectral corresponds respectively to the band pass filter that is configured in a user-side port in this optical splitter.This test spectral is through after each band pass filter generation bandpass filtering, and the test signal that is transferred to each branch optical fiber corresponds respectively to different centre wavelength.The test signal of this different wave length is after branch optical fiber reflects, and reverberation returns this trunk optical fiber through behind this optical splitter.This OTDR just can be known the characteristic of channel of each branch optical fiber by detecting the reverberation of this trunk optical fiber transmission, such as the loss distribution whether disconnected fibre and optical fiber take place etc.
But, in the PON system of big splitting ratio, such as being 1 at splitting ratio: under the network architecture of N, through after the beam split and bandpass filtering of optical splitter, the luminous intensity that sends to the test signal of each branch optical fiber and corresponding reflected signal has only the 1/N of OTDR light source light intensity.Under the situation that adopts secondary beam split or multistage beam split, the luminous intensity of each test signal and reflected signal is lower.Therefore, there is the low problem of light utilization efficiency in the branch optical fiber detection scheme of prior art, and this causes OTDR detected catoptrical signal to noise ratio on trunk optical fiber to cross low and may cause flase drop easily.On the other hand, in the branch optical fiber detection scheme of prior art, need be respectively the different band pass filter of each branch optical fiber configuration in the user-side port of optical splitter, this will cause storage and system maintenance cost too high.
Summary of the invention
In view of this, be necessary to provide a kind of in-problem branch optical fiber detection system of above-mentioned prior art and method of solving, be necessary to provide a kind of Optical Distribution Network and honourable device that adopts this branch optical fiber detection method simultaneously.
For achieving the above object, embodiments of the invention adopt following technical scheme:
The embodiment of the invention provides a kind of branch optical fiber detection system on the one hand, comprise: trunk optical fiber, spectral module and a plurality of branch optical fiber, one end of described trunk optical fiber is coupled with testing equipment, the other end is connected to described a plurality of branch optical fiber by described spectral module, described spectral module comprises at least one optical splitter, each port of described at least one optical splitter is provided with the blooming that is used for the light signal that is sent to described optical splitter port is carried out bandpass filtering according to preset rules, and described blooming makes in the described spectral module different with the passband of the corresponding test link of each branch optical fiber; Described testing equipment is used for according to the pairing optical splitter port of branch optical fiber to be measured, the test waves eldest son that the blooming of selection and described optical splitter port is complementary in test spectral is with, be with corresponding test signal to the fiber optic network transmission with selected test waves eldest son, and receive the reflected signal that described test signal forms at the respective branches fiber reflection, and obtain the characteristic of channel of described branch optical fiber to be measured according to reflected signal.
The embodiment of the invention provides a kind of branch optical fiber detection method on the other hand, be applied to a little arrive the fiber optic network of multiple spot, described fiber optic network comprises: trunk optical fiber, spectral module and a plurality of branch optical fiber, described spectral module comprises at least one optical splitter, each port of described at least one optical splitter carries out plated film according to preset rules so that different with the passband of the corresponding test link of each branch optical fiber in the described spectral module, described method comprises: according to the pairing optical splitter port of branch optical fiber to be measured, the test waves eldest son that the blooming of selection and described optical splitter port is complementary in test spectral is with, be with corresponding test signal to described fiber optic network transmission with selected test waves eldest son, plated film by described optical splitter port, described test signal is through the pairing optical splitter port of described branch optical fiber to be measured and transfer to described branch optical fiber to be measured, and is not entered other branch optical fibers at the optical splitter port of other branch optical fiber correspondences by filtering; Receive the reflected signal that described test signal forms in branch optical fiber reflection to be measured, and obtain the characteristic of channel of described branch optical fiber to be measured according to described reflected signal.
The embodiment of the invention also provides a kind of Optical Distribution Network, comprise trunk optical fiber, spectral module and a plurality of branch optical fiber, wherein, described spectral module comprises at least one optical splitter, each port of described at least one optical splitter is provided with the blooming that is used for the light signal that is sent to described optical splitter port is carried out bandpass filtering according to preset rules, and described blooming makes in the described spectral module different with the passband of the corresponding test link of each branch optical fiber.
Further, the embodiment of the invention also provides a kind of optical splitter that can be used for above-mentioned Optical Distribution Network, it comprises a plurality of optical splitter ports, wherein each optical splitter port carries out bandpass filtering by the mode of plated film to the light signal that is sent to described optical splitter port, and the passband difference of different optical splitter ports.
The various schemes that the embodiment of the invention provides are carried out plated film by the employing of optical splitter port in Optical Distribution Network preset rules and to be implemented in each optical splitter port test signal are carried out bandpass filtering, thereby reduce the storage and the maintenance cost of optical splitter.And, when carrying out the branch optical fiber detection, testing equipment (as optical time domain reflectometer OTDR) is according to the pairing plated film mode of branch optical fiber to be measured, the test waves eldest son who selects the optical splitter port corresponding with described branch optical fiber to be complementary in test spectral is with and sends wavelength and selected test waves eldest son is with corresponding test signal, make in the transmission course of test signal on the test link of branch optical fiber correspondence to be measured and a large amount of optical power attenuation can not take place, thereby the light utilization efficiency when improving the branch optical fiber detection improves measuring accuracy.
Description of drawings
The structural representation of the PON system that the scheme that Fig. 1 provides for the embodiment of the invention can be suitable for;
Fig. 2 adopts one-level to divide the structural representation of light time for the Optical Distribution Network of PON shown in Figure 1 system;
Fig. 3 adopts two-stage to divide the structural representation of light time for the Optical Distribution Network of PON shown in Figure 1 system;
Fig. 4 is that the Optical Distribution Network of PON shown in Figure 1 system adopts the structural representation of multistage minute light time;
Fig. 5 is the branch optical fiber detection system of embodiment of the invention optical splitter port plated film schematic diagram when adopting the one-level beam split;
Fig. 6 adopts two-stage to divide light time second level optical splitter port plated film schematic diagram for the branch optical fiber detection system of the embodiment of the invention;
Fig. 7 adopts two-stage to divide light time first order optical splitter port plated film schematic diagram for the branch optical fiber detection system of the embodiment of the invention;
Fig. 8 is the flow chart of the branch optical fiber detection method of the embodiment of the invention;
Fig. 9 is the flow chart of the branch optical fiber detection system of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing branch optical fiber detection method, system and the optical splitter that the embodiment of the invention provides is described in detail.
The various technical schemes that the embodiment of the invention provides go for a little arriving the fiber optic network of multiple spot, as the passive optical network PON system.For ease of understanding, following examples are that example is described to be applied in the PON system, but, be to be understood that, the various technical schemes that the embodiment of the invention provides are not limited to be applied in the PON system, the person of ordinary skill in the field can know that the various technical schemes that the embodiment of the invention provides can also be applied to other fiber optic networks by the content of following embodiment.
The embodiment of the invention is for solving the problem that prior art exists, adopt preset rules to carry out plated film by optical splitter port in Optical Distribution Network and test signal is carried out bandpass filtering, thereby reduce the storage and the maintenance cost of optical splitter to be implemented in each optical splitter port.And, when carrying out the branch optical fiber detection, testing equipment (as optical time domain reflectometer OTDR) is according to the pairing plated film mode of branch optical fiber to be measured, the test waves eldest son who selects the optical splitter port corresponding with described branch optical fiber to be complementary in test spectral is with and sends wavelength and selected test waves eldest son is with corresponding test signal, make in the transmission course of test signal on the test link of branch optical fiber correspondence to be measured and a large amount of optical power attenuation can not take place, thereby the light utilization efficiency when improving the branch optical fiber detection improves measuring accuracy.
See also Fig. 1, the Organization Chart of the passive optical network PON system that it can be applied in for the embodiment of the invention.Described PON system 100 comprises local side communication equipment (such as optical line terminal OLT) 110, testing equipment (such as optical time domain reflectometer OTDR) 120, Optical Distribution Network ODN 130 and a plurality of user side communication equipment (such as optical network unit ONU) 140.Wherein, described local side communication equipment 110 is connected to described user side communication equipment 140 by described Optical Distribution Network 130 in the mode of putting multiple spot.And, by described Optical Distribution Network 130, at down direction, described local side communication equipment 110 can adopt the mode of Time Division Multiplexing and described a plurality of user side communication equipment 140 to communicate, and at up direction, described a plurality of user side communication equipments 140 can adopt the mode of time division multiple access (TDMA) and described local side communication equipment 110 to communicate.
Described Optical Distribution Network 130 can comprise trunk optical fiber 131, spectral module 132 and a plurality of branch optical fiber 133.Wherein said spectral module 132 comprises network-side port 134 and a plurality of user-side port 135.Described network-side port 134 is connected to described local side communication equipment 110 by described trunk optical fiber 131, and each user-side port 135 is connected to corresponding user side communication equipment 140 by a branch optical fiber 133 respectively.
Described testing equipment 120 can be coupled to described trunk optical fiber 131 by wavelength division multiplexer (WDM), and it can be used for sending test massage to described branch optical fiber 133 by described trunk optical fiber 131 and spectral module 132, and receives the reflected signal that described test signal is returned in described branch optical fiber 133 reflections.In specific embodiment, described testing equipment 120 adopts tunable lasers to carry out the transmission of test signal, and the test signal that is used to detect different branch optical fibers of its transmission has nothing in common with each other.Such as, the test spectral that described testing equipment 120 adopts can comprise that a plurality of test waves eldest sons are with, and the wavelength that it sends is used to detect the test signal of different branch optical fibers can lay respectively at wherein different test waves eldest sons and be with, and promptly different branch optical fibers correspond respectively to different test waves eldest sons and are with.And, described testing equipment 120 inside can be provided with the corresponding relation of described branch optical fiber and wavelength subband in advance, and when a certain branch optical fiber is detected can according to described corresponding relation select the test waves eldest son corresponding with described branch optical fiber with and send corresponding test signal.
In described Optical Distribution Network 130, described spectral module 132 can carry out shunt to the downlink optical signal (comprising the test signal that testing equipment 120 sends) from local side by optical splitter (Splitter) to be handled, and the uplink optical signal from user side is carried out convergence processing.On specific implementation, described Optical Distribution Network 130 can be realized one-level beam split, two-stage beam split or multistage beam split by one or more optical splitters.
Particularly, see also Fig. 2, divide the light time when described Optical Distribution Network 130 employing one-levels, described spectral module 132 can be an independent optical splitter, and each port of this optical splitter can be used as described user-side port 135.See also Fig. 3, divide the light time when described Optical Distribution Network 130 employing two-stages, described spectral module 132 can have a plurality of optical splitters, comprises a first order optical splitter and a plurality of second level optical splitter that is connected to described first order optical splitter.Each port of wherein said first order optical splitter is connected to corresponding second level optical splitter by optical fiber respectively, and each port of described second level optical splitter can be respectively as the user-side port 135 of described spectral module 132.See also Fig. 4, when the described 130 multistage minute light time of employing of Optical Distribution Network, the specific implementation of described spectral module 132 can be carried out corresponding expansion on above secondary beam split basis.
On the other hand, in embodiments of the present invention, the port of each optical splitter in the described spectral module 132 respectively by specific plated film mode to realize bandpass filtering, and the plated film mode of described optical splitter port can promptly make each user-side port 135 pairing passband be difference so that be different with the passband of each branch optical fiber 133 corresponding test links in the described spectral module 132.Such as, described optical splitter port can be coated with specific blooming respectively according to default regulation, and described blooming can be equivalent to the band pass filter of a simplification, is used to limit the test signal that the test link of each branch optical fiber 133 correspondences can pass through.Particularly, described blooming can be so that the user-side port 135 that provide and wavelength and test signal that branch optical fiber 133 to be measured is complementary can be connected by described branch optical fiber 133 to be measured fully by described testing equipment 120, and described test signal is reflected and the reflected signal that forms returns to described testing equipment 120 on described branch optical fiber 133 to be measured, and can be so that the test signal of other wavelength that sent by described testing equipment 120 can't promptly stop the not corresponding test signal of wavelength and branch optical fiber 133 to be measured by described user-side port 135 by described user-side port 135.
For ease of describing, suppose that described Optical Distribution Network 130 can realize that splitting ratio is 1: the light-splitting processing of N.
In a kind of specific embodiment, described Optical Distribution Network 130 adopts the one-level beam split, and N user-side port 135 of described spectral module (promptly independent optical splitter) 132 is coated with different bloomings respectively, and every kind of blooming corresponds respectively to different passbands.On specific implementation, such as, the test spectral that described testing equipment 120 adopts can be carried out the N five equilibrium to form N wavelength subband Δ B 1～Δ B NThe blooming that each port plated of described optical splitter 132 can correspond respectively to one of them wavelength subband (as shown in Figure 5), thereby makes 135 corresponding test signals of branch optical fiber that allow wavelength to be connected with described port of each user-side port pass through.
In another kind of specific embodiment, described Optical Distribution Network 130 adopts the two-stage beam split, and N=m * n.Described spectral module 132 comprises that a splitting ratio is 1: the first order optical splitter of m and m splitting ratio are 1: the second level optical splitter of n.Wherein, the port of a described first order optical splitter and described m second level optical splitter can carry out coating film treatment respectively according to preset rules, so that correspond respectively to different passbands with the corresponding test link of described m * n branch optical fiber in the described spectral module 132, such as the passband that makes that described m * n user-side port 135 is corresponding different respectively.
On specific implementation, alternatively, the test spectral of described testing equipment 120 can be carried out the N five equilibrium and be with Δ B to form N test waves eldest son 1～Δ B NAnd, the passband of m the blooming correspondence that port was coated with of described first order optical splitter is defined as m the first wavelength subband respectively, the passband of n the blooming correspondence that port was coated with of each second level optical splitter is defined as the individual second wavelength subband Δ C of n respectively 1～Δ C nWherein, described m the first wavelength subband has nothing in common with each other, and the port plated film mode of described m second level optical splitter is consistent, and the individual second wavelength subband of described n can be test spectral is carried out the n five equilibrium and to form.And, each second wavelength subband Δ C 1～Δ C nComprise that respectively m test waves eldest son is with.
Such as, suppose N=32 and m=4, n=8, then Δ C 1Can comprise Δ B 1～Δ B 4, Δ C 2Comprise Δ B 5～Δ B 8, by that analogy, as shown in Figure 6.And the n of each second level optical splitter blooming that port plated can correspond respectively to one of them second wavelength subband Δ C 1, Δ C 2... or Δ C nAnd the pairing first wavelength subband of the blooming that each port plated of described first order optical splitter can comprise respectively that the test waves eldest son of n space is with, and the test waves eldest son of a wherein said n space with in each test waves eldest son with laying respectively at the second different wavelength subbands, in addition, the different and crossover not mutually of the pairing first wavelength subband of different port in described first optical splitter.Such as, under the situation of m=4, n=8, the blooming of first port of described first order optical splitter is with Δ B corresponding to eight test waves eldest sons I1(wherein i1=1,5,9,13,17,21,25,29), the blooming of second port is with Δ B corresponding to eight test waves eldest sons I2(i2=2,6,10,14,18,22,26,30), by that analogy, as shown in Figure 7.
Certainly, be to be understood that, the above only is to adopt two-stages to divide a kind of optional plated film mode that the light time can adopt at described Optical Distribution Network 130, the plated film mode that is adopted in practical application, can also adopt other plated film modes, as long as can just can so that described m * n user-side port 135 corresponds respectively to different passbands.
Further, when the described 130 multistage minute light time of employing of Optical Distribution Network, the concrete plated film mode that each optical splitter can adopt in the described spectral module 132 can be analogized with reference to such scheme.Based on above-mentioned PON system 100, the embodiment of the invention at first provides a kind of branch optical fiber detection method.See also Fig. 8, described method can comprise:
Step S1: according to the optical splitter port of branch optical fiber correspondence to be measured, described testing equipment 120 is selected to be with the corresponding test waves eldest son of plated film of described optical splitter port in test spectral, and transmission and the corresponding test signal of described wavelength subband.
Particularly, described testing equipment 120 inside can be provided with in advance branch optical fiber and test waves eldest son with corresponding relation, wherein, each the test waves eldest son in the described test spectral is with and corresponds respectively to a branch optical fiber 133.As mentioned above, in described Optical Distribution Network 130, realize bandpass filtering by the mode of carrying out plated film at the optical splitter port, and the concrete plated film mode of each branch optical fiber 133 pairing optical splitter port can be with respectively so that the passband of bandpass filtering is the test waves eldest son of described branch optical fiber 133 correspondences.Therefore, by described branch optical fiber and test waves eldest son with corresponding relation, described testing equipment 120 just can be known the plated film mode of the pairing optical splitter port of branch optical fiber to be measured, and selects the test waves eldest son who is complementary with described plated film to be with in test spectral.In described corresponding relation, alternatively, described branch optical fiber can be represented by the branch optical fiber sign.Further, described testing equipment 120 can generate and send with described test waves eldest son by its inner tunable laser and be with corresponding test signal, the spectrum width of wherein said test signal can be with for covering described test waves eldest son fully, also can for only for described test waves eldest son with a part, even can also for described test waves eldest son with in the single wavelength signal.
Perhaps, because each branch optical fiber 133 corresponds respectively to different optical splitter ports, therefore described branch optical fiber can be represented by the port numbers of its corresponding optical splitter port, accordingly, described branch optical fiber and test waves eldest son with corresponding relation just can realize by the corresponding relation of optical splitter port numbers and test waves wavelength subband.
When described Optical Distribution Network 130 adopts single-stage to divide the light time, each branch optical fiber 133 is connected to a wherein port of optical splitter, therefore each branch optical fiber 133 corresponds respectively to a port numbers, the port numbers of the port that is connected with described branch optical fiber 133 in the promptly described optical splitter.When described Optical Distribution Network 130 adopts two-stage to divide the light time, each branch optical fiber 133 corresponds respectively to two optical splitter port numbers, one of them be in the optical splitter of the second level with described branch optical fiber 133 corresponding port number, it is the port numbers of the port that is connected with described branch optical fiber 133 in the optical splitter of the described second level, another be in the first order optical splitter with described branch optical fiber 133 corresponding port number, the port numbers of the port that is connected with described second level optical splitter in the promptly described first order optical splitter.Similar ground, when the described 130 multistage minute light time of employing of Optical Distribution Network, each branch optical fiber 133 corresponds respectively to a plurality of optical splitter port numbers.
In the branch optical fiber detection method that present embodiment provides, if described branch optical fiber is represented by its corresponding optical splitter port numbers, then described testing equipment 120 can be selected test waves wavelength subband and generate corresponding test signal according to the optical splitter port numbers of branch optical fiber correspondence to be measured in test spectral.
Step S2: described Optical Distribution Network 130 carries out bandpass filtering to described test signal respectively by the blooming that the optical splitter port in its spectral module 132 inside is plated, described test signal be sent to described branch optical fiber to be measured 133 and stop described test signal to enter other branch optical fibers 133.
Particularly, in described Optical Distribution Network 130, described test signal enters described spectral module 132 by described trunk optical fiber 131, the optical splitter of described spectral module 132 inside carries out light-splitting processing to described test signal and sends to each port of described optical splitter, each port of described optical splitter carries out bandpass filtering to described test signal respectively by the blooming that it plated, so that described test signal by in the described optical splitter with the corresponding port of described branch optical fiber to be measured, and filtered out at other ports, and make be used to detect other branch optical fibers 133 test signal at described optical splitter port by filtering.
Alternatively, divide the light time when described Optical Distribution Network 130 employing two-stages, described step S2 can also comprise:
Described optical splitter will be sent into the next stage optical splitter that is connected with described port with the test signal that described branch optical fiber corresponding port to be measured is passed through, and described next stage optical splitter further carries out light-splitting processing to described test signal and sends to each port of described next stage optical splitter.Similar ground, each port of described next stage optical splitter further carries out bandpass filtering to described test signal respectively by the blooming that it was coated with, so that described test signal is by with described branch optical fiber corresponding port to be measured and send to described branch optical fiber to be measured, and filtered out at other ports of described next stage optical splitter.
Step S3, described branch optical fiber 133 to be measured reflects described test signal at its end, and reflected signal further returns described testing equipment 120 by described branch optical fiber 133 to be measured, spectral module 132 and trunk optical fiber 131.
Particularly, in described fiber optic network, one end of each branch optical fiber 133 proximal subscribers side can be provided with speculum, can be coupled to described branch optical fiber 133 ends by wavelength division multiplexer such as described speculum, perhaps, described speculum also can be arranged in the optical network unit 140 that is connected with described branch optical fiber 133.When test signal is sent to described speculum by described branch optical fiber 133, described test signal will be converted to reflected signal by described mirror reflects.Described reflected signal returns along original route, because the wavelength of described reflected signal is corresponding with described test signal, therefore its blooming that can directly be plated by the optical splitter port on the original route, and enter described testing equipment 120 via described trunk optical fiber 131.
Step S4, described testing equipment 120 receives described reflected signal, and its wavelength detected to obtain its pairing wavelength subband, further, described testing equipment 120 can set in advance the wavelength subband of portion and the corresponding relation of branch optical fiber within it by inquiry, know the pairing branch optical fiber 133 of described reflected signal, promptly described branch optical fiber to be measured, and obtain the characteristic of channel of branch optical fiber 133 to be measured by described reflected signal.
For understanding the scheme that the embodiment of the invention provides better, be that two-stage beam split and splitting ratio are that 1: 32 (first order beam split is 1: 4, and second level beam split is 1: 8) is illustrated for example below with the fiber optic network.
See also Fig. 9, it is the system configuration schematic diagram that 1: 32 fiber optic network carries out the branch optical fiber detection for the present embodiment employing to splitting ratio, be the clearer detection scheme of directly representing present embodiment, Fig. 9 does not express the communication equipment of local side and user side.As shown in Figure 9, described branch optical fiber detection system comprises: tester, splitting ratio are the second level optical splitter that 1: 4 first order optical splitter and four splitting ratios are 1: 8.Wherein, described tester comprises test light transmitting illuminant TLS (Tunable Laser Source, super wideband and tunable laser) and PD (Photo Detector, OPTICAL SENSORS).Wherein said TLS and PD are connected to an end of trunk optical fiber by the optical fiber connector.Described first order optical splitter is connected to the other end of described trunk optical fiber, and it comprises four ports.Described four second level optical splitters are connected respectively to a wherein port of described first order optical splitter, and each second level optical splitter comprises eight ports, be that described four second level optical splitters comprise 32 ports altogether, wherein each second level optical splitter port is connected to a branch optical fiber respectively.
In the present embodiment, the width U-Band of the adoptable test spectral of described tester is 1625nm-1675nm.
Described first order optical splitter and second level optical splitter are realized bandpass filtering by the mode of carrying out plated film at its optical splitter port, and wherein the blooming that plated of the blooming that plated of first order optical splitter port and second level optical splitter port cooperatively interacts, and the passband of the pairing test link of each branch optical fiber is had nothing in common with each other.Such as, in the present embodiment, the port of the port of described first order optical splitter and described four second level optical splitters can adopt broach to intersect the mode of plated film, is implemented in the described first order and the second level to have predefined bandpass filtering function with the pairing test link of each branch optical fiber.
Particularly, above-mentioned broach intersection plated film mode can be as follows:
Because the splitting ratio of described fiber optic network is 1: 32, therefore the width of described test spectral U-Band on average can be carried out 32 five equilibriums, be with Δ B thereby be divided into 32 test waves eldest sons i(1≤i≤32), wherein each test waves eldest son is with Δ B iBandwidth is (1675nm-1625nm)/32.
Four ports of described first order optical splitter are designated as port P respectively 11～P 14, in the present embodiment, port P 11The blooming that is plated can be with Δ B corresponding to the test waves eldest son 1, Δ B 5, Δ B 9, Δ B 13, Δ B 17, Δ B 21, Δ B 25With Δ B 29Set, port P 12The blooming that is plated can be with Δ B corresponding to the test waves eldest son 2, Δ B 6, Δ B 10, Δ B 14, Δ B 18, Δ B 22, Δ B 26With Δ B 30Set, port P 11The blooming that is plated can be with Δ B corresponding to the test waves eldest son 3, Δ B 7, Δ B 11, Δ B 15, Δ B 19, Δ B 23, Δ B 27With Δ B 31Set, port P 11The blooming that is plated can be with Δ B corresponding to the test waves eldest son 4, Δ B 8, Δ B 12, Δ B 16, Δ B 20, Δ B 24, Δ B 28With Δ B 32Set.If the passband of four blooming correspondences that port plated of described first order optical splitter is defined as four first wavelength subbands respectively, the different and crossover not mutually of the first then different wavelength subbands.
In described four second level optical splitters, eight ports of first second level optical splitter are designated as port P respectively 21～P 28, eight ports of second second level optical splitter are designated as P respectively 31～P 38, eight ports of the 3rd second level optical splitter are designated as P respectively 41～P 48, eight ports of the 4th second level optical splitter are designated as P respectively 51～P 58
In the present embodiment, port P 21, P 31, P 41And P 51The blooming that is plated is identical, and it corresponds respectively to the test waves eldest son and is with Δ B 1～Δ B 4Set; Port P 22, P 32, P 42And P 52The blooming that is plated is identical, and it corresponds respectively to the test waves eldest son and is with Δ B 5～Δ B 8Set; Port P 23, P 33, P 43And P 53The blooming that is plated is identical, and it corresponds respectively to the test waves eldest son and is with Δ B 9～Δ B 12Set; Port P 24, P 34, P 44And P 54The blooming that is plated is identical, and it corresponds respectively to the test waves eldest son and is with Δ B 13～Δ B 16Set; Port P 25, P 35, P 45And P 55The blooming that is plated is identical, and it corresponds respectively to the test waves eldest son and is with Δ B 17～Δ B 20Set; Port P 26, P 36, P 46And P 56The blooming that is plated is identical, and it corresponds respectively to the test waves eldest son and is with Δ B 21～Δ B 24Set; Port P 27, P 37, P 47And P 57The blooming that is plated is identical, and it corresponds respectively to the test waves eldest son and is with Δ B 25～Δ B 28Set; Port P 28, P 38, P 48And P 58The blooming that is plated is identical, and it corresponds respectively to the test waves eldest son and is with Δ B 29～Δ B 32Set.
That is to say that for described four second level optical splitters, the plated film mode of its port is unified.If the passband of eight blooming correspondences that port plated of described second level optical splitter is defined as eight second wavelength subbands respectively, the also different also crossover not mutually of the second then different wavelength subbands.Described eight second wavelength subbands can be on average to carry out eight equal parts by the width with described test spectral U-Band to obtain.Thus, eight bloomings that port plated of each second level optical splitter correspond respectively to one of them second wavelength subband, and each second wavelength subband comprises that respectively four adjacent test waves eldest sons are with.
And, by top description as can be seen, the test waves eldest son that each first wavelength subband can correspond respectively to eight spaces is with, and each the first wavelength subband in the first wavelength subband of wherein said eight spaces lays respectively at the second different wavelength subbands.
The concrete course of work of branch optical fiber detection system shown in Figure 9 can be as follows:
At first, described tester is according to the plated film mode of the optical splitter port of branch optical fiber correspondence to be measured, select corresponding test waves eldest son to be with, and adjust the emission wavelength of its inner TLS, so that the passband of the band pass filter that the wavelength of the test signal that described TLS the launches optical splitter port corresponding with described branch optical fiber to be measured forms by plated film is complementary.Suppose first branch optical fiber detected that the wavelength of the test signal of described TLS emission is with Δ B corresponding to the test waves eldest son 1
Be sent to four ports of described first order optical splitter after the light-splitting processing of described test signal through described first order optical splitter, described first order optical splitter carries out filtering to the test signal that is sent to each port respectively by the blooming that each port plated respectively.A because ports having P in the described first order optical splitter 11Passband and described test waves eldest son be with Δ B 1Be complementary, therefore described test signal can only be passed through described port P 11Described first second level optical splitter is gone in the stepping of going forward side by side.
Similar ground is by described port P 11Be sent to eight ports of described first second level optical splitter after the light-splitting processing of the test signal of output through described first second level optical splitter, described second level optical splitter carries out filtering to the test signal that is sent to each port respectively by the blooming that each port plated respectively.A because ports having P in the described first order optical splitter 21Passband and described test waves eldest son be with Δ B 1Be complementary, therefore described test signal can only be passed through described port P 21First branch optical fiber is gone in the stepping of going forward side by side.The filter action of the blooming that is plated by the optical splitter port, described test signal is restricted to and can only be sent to described branch optical fiber to be measured.
Further, described branch optical fiber to be measured is launched described test signal at its end, and reflected signal further is back to described tester by original route, and is received by the PD of described tester.Then, described tester can carry out wavelength to its reflected signal that receives and detects and to be with Δ B with the test waves eldest son that wavelength was positioned at who obtains described reflected signal 1, know the pairing branch optical fiber of described reflected signal thus, promptly described branch optical fiber to be measured, further, described tester can get access to the characteristic of channel of branch optical fiber to be measured by described reflected signal.
Through the above description of the embodiments, one of ordinary skill in the art will appreciate that: realize that all or part of step in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, this program is when carrying out, comprise step as above-mentioned method embodiment, described storage medium, as: ROM/RAM, magnetic disc, CD etc.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (13)

1.一种分支光纤检测系统，包括：主干光纤、分光模块和多个分支光纤，所述主干光纤的一端耦合有测试设备，另一端通过所述分光模块连接到所述多个分支光纤，其特征在于：1. A branch optical fiber detection system, comprising: a trunk fiber, a splitting module and a plurality of branch fibers, one end of the trunk fiber is coupled with a testing device, and the other end is connected to the plurality of branch fibers by the splitting module, which Features: 所述分光模块包括至少一个分光器，所述至少一个分光器的各个端口按照预设规则设置有用于对传送至所述分光器端口的光信号进行带通滤波的光学膜，且所述光学膜使得所述分光模块中与各个分支光纤相对应的测试链路的通带不同；The optical splitting module includes at least one optical splitter, each port of the at least one optical splitter is provided with an optical film for band-pass filtering the optical signal transmitted to the port of the optical splitter according to preset rules, and the optical film making the passbands of the test links corresponding to the respective branch fibers in the optical splitting module different; 所述测试设备用于根据待测分支光纤所对应的分光器端口，在测试光谱中选择与所述分光器端口的光学膜相匹配的测试波长子带，向光纤网络发送与所选测试波长子带相对应的测试信号，并且接收所述测试信号在对应分支光纤反射而形成的反射信号，并根据反射信号获取所述待测分支光纤的信道特性。The test equipment is used to select a test wavelength sub-band matching the optical film of the optical splitter port in the test spectrum according to the splitter port corresponding to the branch fiber to be tested, and send the selected test wavelength sub-band to the optical fiber network. carrying a corresponding test signal, receiving a reflection signal formed by reflecting the test signal on a corresponding branch fiber, and acquiring the channel characteristics of the branch fiber to be tested according to the reflection signal. 2.如权利要求1所述的分支光纤检测系统，其特征在于，所述分光模块为一个分光比为1∶N的分光器，所述测试光谱包括N个测试波长子带，且所述分光器的每个端口所设置的光学膜分别对应于一个测试波长子带。2. The branch optical fiber detection system according to claim 1, wherein the splitting module is a splitter with a splitting ratio of 1:N, the test spectrum includes N test wavelength subbands, and the splitting The optical film provided on each port of the device corresponds to a test wavelength sub-band respectively. 3.如权利要求1所述的分支光纤检测系统，其特征在于，所述测试光谱包括N个测试波长子带，所述分光模块的分光比为1∶N，其中N＝m×n，且所述分光模块包括一个连接到所述主干光纤且分光比为1∶m的第一级分光器和m个分光比为1∶n的第二级分光器，其中所述m个第二级分光器分别连接到所述第一级分光器的m个端口，且不同的第二级分光器端口分别连接到不同的分支光纤。3. The branch optical fiber detection system according to claim 1, wherein the test spectrum comprises N test wavelength subbands, and the splitting ratio of the light splitting module is 1: N, wherein N=m×n, and The light splitting module includes a first-level light splitter connected to the trunk fiber with a light splitting ratio of 1:m and m second-level light splitters with a light splitting ratio of 1:n, wherein the m second-level light splitters The switches are respectively connected to the m ports of the first-stage optical splitter, and different ports of the second-stage optical splitter are respectively connected to different branch fibers. 4.如权利要求3所述的分支光纤检测系统，其特征在于，所述第一级分光器的m个端口所设置的光学膜分别对应于m个不同的第一波长子带，所述m个第二级分光器的端口镀膜方式是一致的，且每个第二级分光器中n个端口所设置的光学膜分别对应于n个不同的第二波长子带，其中不同的第一波长子带不相互交迭，不同的第二波长子带也不相互交迭，每个第二波长子带分别包括m个相邻的测试波长子带，每个第一波长子带分别包括n个相互间隔的测试波长子带，且其中所述n个相互间隔的第一波长子带中的各个测试波长子带分别位于不同的第二波长子带。4. branch optical fiber detection system as claimed in claim 3, is characterized in that, the optical film that the m ports of described first-order beam splitter is provided with corresponds to m different first wavelength sub-bands respectively, and described m The port coating methods of the second-level optical splitters are consistent, and the optical films provided on the n ports in each second-level optical splitter correspond to n different second wavelength subbands, wherein the different first wavelength The sub-bands do not overlap with each other, and the different second wavelength sub-bands do not overlap with each other, each second wavelength sub-band includes m adjacent test wavelength sub-bands, and each first wavelength sub-band includes n The test wavelength sub-bands are spaced apart from each other, and each test wavelength sub-band in the n spaced first wavelength sub-bands is respectively located in different second wavelength sub-bands. 5.如权利要求1所述的分支光纤检测系统，其特征在于，所述预设规则为梳齿交叉间隔的镀膜方式。5 . The branch optical fiber detection system according to claim 1 , wherein the preset rule is a coating method with intersecting comb teeth. 6 . 6.如权利要求1至5中任一项所述的分支光纤检测系统，其特征在于，所述测试设备内部预先设置有分支光纤与测试波长子带的对应关系，其中不同的测试波长子带分别对应于不同的分支光纤，且所述测试设备在对待测分支光纤进行检测时可根据所述对应关系选择与所述待测分支光纤对应的测试波长子带并发送对应波长的测试信号。6. The branched optical fiber detection system according to any one of claims 1 to 5, wherein the test equipment is preset with a corresponding relationship between the branched optical fiber and the test wavelength sub-band, wherein different test wavelength sub-bands Corresponding to different branch fibers respectively, and the test equipment can select the test wavelength sub-band corresponding to the branch fiber to be tested according to the corresponding relationship when detecting the branch fiber to be tested and send the test signal of the corresponding wavelength. 7.如权利要求1至5中任一项所述的分支光纤检测系统，其特征在于，所述测试设备内部预先设置有分光器端口号与测试波长子带的对应关系，其中不同的测试波长子带分别对应于不同的分光器端口号，且所述测试设备在对待测分支光纤进行检测时可根据所述对应关系选择与所述待测分支光纤连接到的分光器端口的端口号对应的测试波长子带并发送对应波长的测试信号。7. The branch optical fiber detection system according to any one of claims 1 to 5, wherein the test equipment is preset with the corresponding relationship between the port number of the optical splitter and the test wavelength sub-band, wherein different test wavelengths The sub-bands correspond to different optical splitter port numbers, and the test equipment can select the port number corresponding to the optical splitter port connected to the optical splitter port to which the branch optical fiber to be tested is connected according to the corresponding relationship when the test equipment detects the branch fiber to be tested. Test the wavelength sub-band and send the test signal corresponding to the wavelength. 8.一种分支光纤检测方法，应用于点到多点的光纤网络，所述光纤网络包括：主干光纤、分光模块和多个分支光纤，所述分光模块包括至少一个分光器，所述至少一个分光器的各个端口按照预设规则进行镀膜以使所述分光模块中与各个分支光纤相对应的测试链路的通带不同，其特征在于，所述方法包括：8. A branch optical fiber detection method, applied to a point-to-multipoint optical fiber network, said optical fiber network comprising: a trunk optical fiber, an optical splitting module and a plurality of branch optical fibers, said optical splitting module comprising at least one optical splitter, said at least one Each port of the optical splitter is coated according to preset rules so that the passbands of the test links corresponding to the respective branch fibers in the optical splitting module are different, wherein the method includes: 根据待测分支光纤所对应的分光器端口，在测试光谱中选择与所述分光器端口的光学膜相匹配的测试波长子带，向所述光纤网络发送与所选测试波长子带相对应的测试信号，通过所述分光器端口的镀膜，所述测试信号经过所述待测分支光纤所对应的分光器端口并传输至所述待测分支光纤，而在其他分支光纤对应的分光器端口被滤除而不进入其他分支光纤；According to the optical splitter port corresponding to the branch fiber to be tested, select the test wavelength sub-band matching the optical film of the optical splitter port in the test spectrum, and send the test wavelength sub-band corresponding to the selected test wavelength sub-band to the optical fiber network The test signal passes through the coating of the optical splitter port, the test signal passes through the optical splitter port corresponding to the branch fiber to be tested and is transmitted to the branch fiber to be tested, while the optical splitter port corresponding to the other branch fiber is received Filter out without entering other branch fibers; 接收所述测试信号在待测分支光纤反射而形成的反射信号，并根据所述反射信号获取所述待测分支光纤的信道特性。receiving a reflection signal formed by reflecting the test signal on the branch fiber to be tested, and acquiring channel characteristics of the branch fiber to be tested according to the reflection signal. 9.一种光分配网络，其特征在于，包括主干光纤、分光模块和多个分支光纤，其中，所述分光模块包括至少一个分光器，所述至少一个分光器的各个端口按照预设规则设置有用于对传送至所述分光器端口的光信号进行带通滤波的光学膜，且所述光学膜使得所述分光模块中与各个分支光纤相对应的测试链路的通带不同。9. An optical distribution network, characterized in that it includes a trunk optical fiber, an optical splitting module, and a plurality of branch optical fibers, wherein the optical splitting module includes at least one optical splitter, and each port of the at least one optical splitter is set according to preset rules There is an optical film for band-pass filtering the optical signal transmitted to the port of the optical splitter, and the optical film makes the pass bands of the test links corresponding to each branch optical fiber in the optical splitting module different. 10.如权利要求9所述的光分配网络，其特征在于，所述至少一分光器用于接收通过所述主干光纤传送的测试信号，其中所述测试信号的波长位于测试光谱中的预设波长子带，且所述预设波长子带与待测分支光纤所镀的光学膜相匹配。10. The optical distribution network according to claim 9, wherein the at least one optical splitter is used to receive a test signal transmitted through the backbone optical fiber, wherein the wavelength of the test signal is located at a preset wavelength in the test spectrum sub-band, and the preset wavelength sub-band matches the optical film coated on the branch fiber to be tested. 11.如权利要求10所述的光分配网络，所述测试光谱包括N个测试波长子带，所述分光模块的分光比为1∶N，其中N＝m×n，且所述分光模块包括一个连接到所述主干光纤且分光比为1∶m的第一级分光器和m个分光比为1∶n的第二级分光器，所述第一级分光器的m个端口所设置的光学膜分别对应于m个不同的第一波长子带，所述m个第二级分光器的端口镀膜方式是一致的，且每个第二级分光器中n个端口所设置的光学膜分别对应于n个不同的第二波长子带，其中不同的第一波长子带不相互交迭，不同的第二波长子带也不相互交迭，每个第二波长子带分别包括m个相邻的测试波长子带，每个第一波长子带分别包括n个相互间隔的测试波长子带，且其中所述n个相互间隔的第一波长子带中的各个测试波长子带分别位于不同的第二波长子带。11. The optical distribution network according to claim 10, the test spectrum includes N test wavelength subbands, the splitting ratio of the optical splitting module is 1: N, where N=m×n, and the optical splitting module includes A first-level optical splitter connected to the trunk fiber with a splitting ratio of 1:m and m second-level optical splitters with a splitting ratio of 1:n, the m ports of the first-level optical splitter are set The optical films respectively correspond to m different first wavelength subbands, the port coating methods of the m second-level optical splitters are consistent, and the optical films provided for the n ports in each second-level optical splitter are respectively Corresponding to n different second wavelength subbands, wherein different first wavelength subbands do not overlap with each other, and different second wavelength subbands do not overlap with each other, and each second wavelength subband includes m phase Adjacent test wavelength subbands, each first wavelength subband includes n mutually spaced test wavelength subbands, and wherein each test wavelength subband in the n mutually spaced first wavelength subbands is located in a different of the second wavelength subband. 12.如权利要求11所述的光分配网络，其特征在于，所述预设规则为梳齿交叉间隔的镀膜方式。12. The optical distribution network according to claim 11, wherein the preset rule is a coating method with intersecting comb teeth. 13.一种用于如权利要求9所述的光分配网络的分光器，其特征在于，包括多个分光器端口，其中各个分光器端口通过镀膜的方式对传送至所述分光器端口的光信号进行带通滤波，且不同分光器端口的通带不同。13. An optical splitter for the optical distribution network according to claim 9, characterized in that it comprises a plurality of optical splitter ports, wherein each optical splitter port is coated on the light transmitted to the optical splitter port The signal is bandpass filtered, and the passbands of different optical splitter ports are different.
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